Changing DPI scaling size of display make Qt application's font size get rendered bigger

Question

I have created some GUI application using Qt. My GUI application contains controls like push button and radio button. When I run the application, buttons and fonts inside bu

Answer 1

High DPI support is enabled from Qt 5.6 onward.

Setting QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling) in your application source code allows automatic high-DPI scaling.

NOTICE: To use the attribute method, you must set the attribute before you create your QApplication object:

#include 

int main(int argc, char *argv[])
{
    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QApplication app(argc, argv);   
    return app.exec();
}